[OpenSIPS-Users] Attended call transfer in opensips with use of RTPengine

[Bogdan-Andrei Iancu]

Hi Simon,

If you have OpenSIPS and a simple SIP proxy (not a B2B), you must not 
reply to the REFER, but to let it be routed as an in-dialog request to 
the other end-point, as that end-point will actually do the transfer 
(starting the new call).

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
OpenSIPS eBootcamp 23rd May - 3rd June 2022
   https://opensips.org/training/OpenSIPS_eBootcamp_2022/

On 3/2/22 12:02 PM, Simon Gajski wrote:
>
> Hi
>
> no, we don't use B2B on OpenSIPS  side. Is this the correctway to do it?
> The thing is that I don't know what would be the best way to implement 
> this with use of RTPengine.
> I found very little info available online.
>
> Call forwards that I manually set in DB (cfu, cfnr, cfb.....like we 
> were doing on last bootcamp) are working fine.
> Only issue is with answered call and then attempting to transfer it.
>
> BR
> Simon
>
>
>
> Bogdan-Andrei Iancu je 01.03.2022 ob 15:30 napisal:
>> Hi Simon,
>>
>> Do you use B2B on the OpenSIPS side ? Which entity is actually 
>> performing the transfer ?
>>
>> Regards,
>> Bogdan-Andrei Iancu
>>
>> OpenSIPS Founder and Developer
>>    https://www.opensips-solutions.com
>> OpenSIPS eBootcamp
>>    https://www.opensips.org/Training/Bootcamp
>> On 2/24/22 1:54 PM, Simon Gajski via Users wrote:
>>>
>>> Hi
>>>
>>>
>>> I am using opensips 3.2 with rtpengine on same server and trying to 
>>> achieve attended call transfer.
>>>
>>> In theory, I'm trying to do:
>>> 1. A calls B...and B answers
>>> 2. B puts A on hold (MOH is played from RTPengine)
>>> 3. B calls C...and C answers
>>>
>>> Now the funny part:
>>> B tries to transfer A to C and sends REFER to opensips
>>> In opensips I responds with 202 Accepted and B gets disconnected.
>>>
>>> However A and C don't get connected together
>>> A still receives MOH and C has no voice
>>>
>>> We have another installation of opensips where REFER handles 
>>> Freeswitch, and there such type of transfer is working fine.
>>>
>>> Can someone help me how to handle such call behaviour in opensips 
>>> with RTPengine?
>>>
>>>
>>> relevant part of code:
>>>
>>> route[handle_sequential]{
>>> ...
>>> if(is_method("REFER")) {
>>>         xlog("[IN_DIALOG] [$rm] Transfer from $fu to $tu");
>>>         send_reply(202, "Accepted");
>>>
>>>         #what next?
>>>
>>>         exit;
>>>     }
>>> ...
>>> }
>>>
>>>
>>> Thank you!
>>>
>>> Simon
>>>
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opensips.org
>>> http://lists.opensips.org/cgi-bin/mailman/listinfo/users
>>

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